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When possible, avoid taking wal file read-lock 0 in sqlite3_snapshot_get().

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FossilOrigin-Name: 34b6ac3d76dbc6819778ec2a0f81cbcdcc0cd1a6303381d97f1c479e4ecdd132
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dan
2024-09-26 18:02:17 +00:00
parent 8cd30e3f5b
commit d0720eee5e
5 changed files with 72 additions and 13 deletions
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src/main.c
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@@ -4963,7 +4963,11 @@ int sqlite3_snapshot_get(
if( iDb==0 || iDb>1 ){
Btree *pBt = db->aDb[iDb].pBt;
if( SQLITE_TXN_WRITE!=sqlite3BtreeTxnState(pBt) ){
Pager *pPager = sqlite3BtreePager(pBt);
i64 dummy = 0;
sqlite3PagerSnapshotOpen(pPager, (sqlite3_snapshot*)&dummy);
rc = sqlite3BtreeBeginTrans(pBt, 0, 0);
sqlite3PagerSnapshotOpen(pPager, 0);
if( rc==SQLITE_OK ){
rc = sqlite3PagerSnapshotGet(sqlite3BtreePager(pBt), ppSnapshot);
}